Highest temperature in Toronto on May 29?

Prediction market odds on Polymarket reflect real-money trader expectations and often diverge from traditional weather forecasts issued by meteorologists and climate analysts. While Environment Canada and other official forecasters rely on atmospheric modeling and historical data, prediction markets incorporate forward-looking sentiment and aggregate dispersed information from many participants. Comparing the market's implied probability for a 25°C+ high against seasonal normals and official extended forecasts can reveal whether traders expect warmer or cooler conditions than baseline predictions suggest for late May in Toronto.

The market resolves on May 29, 2026, after the highest temperature recorded in Toronto on May 29 is finalized. The outcome is determined by official temperature data for that date, typically sourced from Environment Canada or recognized meteorological stations in the Toronto area. Once the day's high is confirmed, the market settles based on whether it meets or exceeds the specified threshold, and traders' positions are paid out accordingly.

Several factors could shift market odds before May 29. Extended weather forecasts and updated atmospheric models from meteorological agencies will influence trader expectations as the date approaches. Major weather patterns—such as high-pressure systems, cold fronts, or unusual jet-stream positioning—can significantly alter temperature predictions. Additionally, historical temperature anomalies, seasonal climate patterns, and real-time weather developments in late May will prompt traders to reassess probabilities and adjust their positions, driving price movements on the market.